Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee789a05abe4b05…

MALICIOUS

PDF

92.8 KB Created: 2021-09-17 13:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e113ca41ec8e5e6b815cbc9fe85fd501 SHA-1: 4977a84e1f1317b45aaff9d9e63cdcc107976f22 SHA-256: 6ee789a05abe4b050c3e7da29ab4c712bfbad9d28caf9ffde0bb64aba9da037f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and link farms suggests an attempt to lure users to external sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=free+real+ig+likes PDF link annotation
    • http://n3ss.ro/ckfinder/userfiles/files/85421187430.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/16124635646.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fada198f2d---19599590023.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/labosegefisad.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/6236785055.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/37221075093.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/jukajon.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/67109424994.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/lojewavaduma.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/dijimatejupewek.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ec6216297bb5d8d355654060b785aaec/49781982478.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/18982243191.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/fapejifevasawi.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/78795951555.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613550bccebb1---71028111959.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/41075321017.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/zaborozilikefotojulilumum.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/65463315641.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/23830854764.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/58767482118.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/taboxolivefaxuwozida.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/pedonuwuzevabopafexilevip.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140a862aae68---verunomakepof.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314256412b7---kogujerawomevite.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a07f04c110---tusanazosulezaganika.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ee8a7c6c28b8d97d6307117a3e2fe196/mufaxunirobizuvet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 18720 bytes
SHA-256: 9fc6e6df5fe7bff7b36b46ac96d98275fe909f7b8d2cbb1fd257f2ce605295db
font_01_sfnt_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 10028 bytes
SHA-256: a74c22dc82f15d29196393821985699c15fe5798821394c0eba96e4006f39197
font_03_sfnt_off00013413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13413 18912 bytes
SHA-256: 7fbdda00a8e210be99485bc02a66cce36d15dcb91ebd5d29af8d7772b51f721d

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